On 04 Mar 2006, Chris Styles wrote:

As part of our research for the Contamination Control DustBubble
Kit we had quite a bit of particle data generated from
different methods of drilling. The envelope method is remarkably
ineffective. Even the CCDB kit is less than 99.9% effective, but
it is still reduces the particle emissions to 100x lower than
the allowed limit for asbestos.

Of course it might be that the envelope method is good enough
and so be it. Some folk still use matchsticks rather than spend
a few pennies on an anchor, and in the same way people will
continue to use an envelope instead of an inexpensive product
that does a far better job.

Personally I'm particularly proud of the DustBubble because they
are cheap, take no time to use and work remarkably well.
Starting this business has been a nightmare, but every time I
do some drilling at home and use them it reminds me why I did...


Ah so you are Mr DustBubble! :-)

In the UK DustBubble sells for about £2 for 12.
http://www.aces.uk.com/18/DustBubble/DIYDustBubble/

This is about 16p (or approx 25 US cents) each. Not so economical
really.